Honeywell cm921 User Manual

CM921

WIRELESS PROGRAMMABLE THERMOSTAT

PRODUCT SPECIFICATION SHEET

The CM921 thermostat is designed to provide automatic time and temperature control of heating or cooling systems in villas and apartments.

It can be used as part of a system in conjunction with combiboilers, oil-burners and gas fired boilers, circulation pumps, thermal actuators, zone values and electric heating systems (<10A). In combination with other CM921 room units and HC60NG receivers it can be used to control multi-zone applications (up to 4 zones).

The radio frequency controlled CM921 system pack consists of a room unit CMT921A and a relay box R6660D (HC60NG). No wiring to the room unit is required. The installer only needs to wire the relay box to the controlled device (e.g. boiler) and mount the room unit in a suitable location where RF communication is reliable. The CM921 uses reliable RF communication technology in the 868MHz band.

The CM921 extra large LCD display, dynamic text display and controls layout are identical to the CM901 ‘wired’ thermostat. The unit is ideal for consumers who want reliable and precise temperature control from a modern looking, simple to program and easy-to-use product.

FEATURES

CM921 can be installed without disrupting your room décor

•

as no wiring connection is required between the room unit and the boiler

• Attractive, slim, ultra-modern styling makes it ideal for

location in any type of home

• 1-day heating programming

• A dynamic text display on the LCD that gives enhanced

feedback to the user / installer

• LCD Backlighting to illuminate the display for easier viewing

in low light conditions

• Reliable RF communication utilising 868 MHz band with 1 %

duty cycle limit to minimise communication disturbance

• Every room unit can be bound with several relay boxes (e.g.

to control several electric heating panels)

• Armchair programmed

• Holiday button that provides energy savings by reducing

to a constant temperature for 1 to 99 days when people are on holiday, returning to normal operation (AUTO or MANUAL) on the day of their return.

• EEPROM memory holds the user program indefinitely

• OFF position has an integral frost protection setting at

minimum 5°C (installer adjustable) so that pipes in the house will never freeze in winter.

• Communication compatibility with other Honeywell product

such as HR80, HM80 and HCE80.

• CM921 can be used to control a zoning system with up to 4

zones

• Maximum system efficiency and extended boiler life due to

unique zoning system synchronisation

• Automatic Summer / Winter time change adjusts the time

automatically to daylight saving time.

• Standard room units and receiver boxes are used for zoning

applications algorithm

• When used with the table top stand the room unit can be

positioned anywhere in the room where RF communication is reliable

• 24...230V 10A resistive, 3A inductive SPDT relay provides

compatibility with most domestic central heating systems reducing the need to stock many different models.

• The HC60NG may be surface or wallbox mounted.

• Installer Set-Up Mode allows extra functions to be set at the

discretion of the installer to match the consumer applications and needs:

• Optimisation

• Pump Exercise

• Upper / Lower Setpoint Limit Adjust

• Temperature offset

• Minimum ON time

• Cycle rate

• Heat / Cool Operation

• Proportional Band Width

• Fail-safe mode for communication loss

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CONTROLS/DISPLAY LAYOUT

Room Unit Layout:

1. Day & Date Display

2. Time Display

3. Dynamic Text Display (DTD)

4. Burner On Indicator

5. Battery Low Indicator

6. Temperature Display

7. Temperature Change Buttons

8. Information Enquiry Button

9. Slider Switch

10. Green OK Button

11. Program Buttons

12. Battery Cover

13. Battery Compartment

14. Holiday Button

15. Time Change Buttons

SPECIFICATIONS

CM921 CHRONOTHERM

ELECTRICAL

Room unit power supply

Battery life : Minimum 2 years Battery

replacement Receiver power

supply Switch type : SPDT potential free Output rating : 24-230 V AC, 10 A resistive, 3 A inductive

Wiring (receiver only)

Wire access : from the rear (wall box mounting), right

: 2 x 1.5 V IEC LR6 (AA) Alkaline cells

: Program retained in EEPROM

: 230V AC +10% - 15%, 50Hz

0.6 p.f.

: Cable terminals for mains and relay wiring

for max 2.5 mm

wire

and bottom

RF operation band : ISM (868.0-868.6) MHz, 1% duty cycle RF communication

: 30 m in a residential building environment

range RF communication

technology

: short, high rate transmissions to minimise

air time and avoid collisions

Blocking immunity : Receiver class 2 (ETSI EN300 220-1

version 1.3.1)

RF binding method : Factory pre-bound with the room unit.

ENVIRONMENTAL & STANDARDS

Operating temperature

Shipping & storage temperature

Humidity : Humidity range 10 to 90% rh, non-

IP class : 30 Meeting the

following standards

: 0 to 40oC when relay load < 8 A : 0 to 30oC when relay load > 8 A

: -20 to 55

condensing

: EN60730-1(Nov 2000), EN55014-1(1997),

EN55014-2(2000), ETSI EN300 220-3 (2000), ETSI EN301 489-3(2000)

TEMPERATURE CONTROL

Sensing element : 100K (@ 25 oC ) NTC thermistor Control form : Fuzzy Logic Algorithm Minimum ON

time

10% of cycle time (min one minute), adjustable to 2 to 5 min (see installer set up)

Cycle rate : Selectable by application (see installer

set up)

Temperature control accuracy

0.5 K (nominal) @ 20oC, 50% load 3K

Δ/hour

Fail-safe mode : Off or cycling depending on the CM927

system set-up

TIME SETTING/PROGRAMMING

Time display : 24 hour or 12 hour AM/PM format Time keeping

accuracy Program : 1-day with 6 daily time and temperature

Time setting resolution

Temperature setting range

Room Temperature display range

: Typically better than 10 minutes per year

level changes

: Time of day - 1 minute

Program – 10 minute steps

: Program : 5 to 35

: 5

C to 16 oC). Frost protection does not

C in 0.5 oC steps Frost

C or equal to lower limit (5

work in cooling mode

: From 0

C to 50 oC

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In Install

INSTALLER SET-UP

To enter the installer set-up mode:

a) Move the slider switch to the OFF position.

b) Press and hold the INFO

buttons ‘< >’ together.

c) The unit will display the first parameter of installer

parameter group category 1 (from n.1 to n.19).

d) Press the TEMP

setting. The display will flash indicating that a change has been made.

e) Press the green OK button to confirm this change and the

display will stop flashing.

f) Press the

+ button to go to the next parameter.

g) Press the program button

Installer mode (from n.1 to n.14).

h) To exit the installer mode, move the slider switch to the

AUTO or MAN positions.

i button and the two program

or buttons to change the factory

> to go to category 2 in the

Abbreviated Set-Up Description

e.g. Cl = Clock Format

CM921 CHRONOTHERM

Factory Setting or New Choice

Press TEMP or to change

e.g. 12 = AM/PM Format

24 = 24hr Format

Installer Set-up Number

(Press + or - to change)

e.g. 1 = Clock Format

er set-up we can:

❑ Set-up specific applications parameters ❑ Enable special features

❑ Configure system timing master for the zoning system

Specific Applications Setting What do you need to change?

Heating Gas Boilers

(<30KW)

Air

Oil Boiler 3 4 1. Set Minimum ON Time to 4 minutes.

Thermal Actuator 12 1 Set Cycle/Hour to 12.

Zone valve 6 1 No changes required.

conditioning

Heat Pump/ Air conditioner

Fan coil 6 1 No changes required.

Cycle/ Hour

Minimum ON time

(in minutes)

6 1 No changes required

3 4 1. Set Minimum ON Time to 4 minutes.

Note : All parameters listed below belong to category 2 – System Parameters (see Installer Parameters Table)

2. Set Cycle/Hour to 3.

1. Configure the thermostat to allow switching between heating and cooling modes (set parameter n.4:HC to 1)

2. Set the thermostat accordingly to the required mode of operation (heating or cooling) by pressing the TEMP

buttons together for 5 seconds.

as required.

2. Set Cycle/Hour to 3.

Brief Description of the Parameter Function.

Modify the cooling program

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